Improvement in mortising-machines



' UNITED' STATES 'PATENT Fries.

CARL L. znmnnn, oro-INCINNATI, onto.

AIMPROVM ENT lNMORTlSlNG-MACHINES.

Specification forming part ofLetters Patent No. 48,863, dated July 18,1865.

to the accompanying' d ra-win gs, making part of this specification.

My i mprovement n'elates tothe cl ass of powermachines for sinkingmortises in wood whose Ychisel-action can be, started and increased ordiminishedn itsY length if stroke at the will of the operatorwithontdisconnection from the motor; and my invention consists in an equablyoperating and effective device for changing or `converting a merelyaxial rotation of thedriving-sheave or wrist to revolution in an orbitof greater or iess diameter, according to the length -of stroke desired,the said device, in its operation, being free from the violentconcussions and surging motions commonly incident to machinesof thisclass.

Figure 1 is a perspective view of a machine embodying my improvement..Fig.' 2 is a frontl elevation of the variable sheave and itsaccessories. Fign shows :,rmoditcation of my invention. `l

Av is a frame, having near its upper part two horizontal bearings (ofwhich the rear one, B, only is shown) for a main shaft, C, having acollar or ily-wheel, D., y

F is a variable sheave, connected to the collar D by a pivot-bolt, E,whichrbolt is located ain equal distance from the centers of both thecollar and the sh'eavet rEhe sheave F, in its non-eifective position,remains coaxial with the collar Dand main shaft C, but is capable ofbeing vibrated upon the bolt E asa center, so as to assume anyldesiredeccentrieity with said shaft and collar. A strap, H, and rod G connect`the sheave F'with the chisel-mandrel.

I is a box, restricted to a sliding`motion along the'maiu shaft C bymeans of a groove, fi, whichfitsa feather, c, on said shaft. The box Iand the siteave F are connected theone to the other by universal jointsjand j at the extremities of a toggle-arm,J The box I, be-` ing slidforward along 'the main shaft C, acts through the toggle-arm J' to pushthc sheave F out of center with the said shaft, so as to cause areciproeation of the chisel. This sliding forward of the box I iseffected by the operator through the medium of a treadle, K,

rod L, bell-crank M, and one or 'more links, N,

pivoted to a strap, 0, which embraces the sliding box I. v l

y A spring, P, pressing backward against the bell-crank M, acts torestore the sheave F to its central or inactive position the instantthat the operators foot is withdrawn from the treadle.

ble sheave, respectively, and concentric with the pivot-bolt E, permitthe vibrations of the said sheave to be etfected without obstruction.

from thefjointj and main shaft C.

I have selected to illustrate my invention the form preferred andsuccessfully employed by me; but various modifications mayobviously 'bemade without departing from theessential characteristics of theimprovement. For example, the portion of the main shaft over which thebox l slides maybe square or ot' other polygonal or irregular form, theaperture of the box being,.ot" course, a corresponding section. The saidbox .may be retracted by a' weight in place of spring P. A hand-levermay. lbe used in place ot' or in addition to thctreadle K,while stillanother modification may bc employed, as follows:

It, Fig.3, is a crank attached tothe rear end loflthe pivot-bolt E, thecrank-.pin 1' being connected to the sliding box in a similar manner tothe connectionv of the sheavc therewith in Fig. l. The frontend ofthepivot-boltEmay have either a crank and wrist,` S s, or a sheave, asinFigs. l and 2. 4

1 do not claim throwing amortsing-chisel in and ont of action by meansof a treadle, as I am aware that is donc by mechanism differ- 'ent frommine in the lnortising-machine of Joseph Guild, patented November 30,1852.

I claim herein as new and of my invention- "t l. The sheavc or wrist F,pivoted eccentrically upon its driving-shaft and employed to give motionto a mortising-chisel or analogous tool at the will ofthe operator.

2. The toggle-arm J and sliding box Lin combination with a treadle-leveror its equivalent, and with an eccentric sheave or wrist, for throwingthe tool into and out of action, substantially as set forth. 1

In testimony of which invention I hereunto set my hand.

' CARL L. ZEIDLER.

-Witnessesz' GEO. H. KNIGHT, J AMES H. LA YMAN,

Curved slotsd and f in the collar and varia'

